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In this paper, the design and implementation of a non-electrolytic capacitor LED driver is proposed. The proposed driver includes a Boost PFC converter as first-stage and a LLC Resonant Converter as second-stage. With feedforward control, the output current ripple can be reduced without electrolytic capacitor, the lifetime of the driver will be increased. In this paper, the operating principles of...
Single stage Flyback converter with active power factor correction (PFC) function built-in is very popular for low power LED driver application. However, a universal driver design (120V∼277Vac wide input) for meeting PF>0.90 and THD<20% at 50% of maximum output power remains very challenging using peak current transition mode (PCTM) PFC control. Therefore, in this paper, a novel and practical...
A primary-side quasi-resonant (QR) controller IC for single-stage flyback LED driver with high power factor (PF) and low total current harmonic distortion (THDi) is proposed in this paper. Conventionally, the flyback PFC converter with critical conduction mode QR control will suffer from higher switching loss and occur higher THDi at high line condition. To solve this problem, a frequency limit QR...
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